Aqueous fluoro modified urethane resin and preparation of aqueous fluoro modified urethane resin paint
A technology of fluorine-modified polyurethane and polyurethane resin, which is applied in the field of preparation of water-based polyurethane resin, which can solve the problems of anti-fouling, poor self-cleaning, high critical surface tension, etc., and achieves convenient construction, low VOC content, and good adhesion Effect
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Embodiment 1
[0042] Embodiment 1: a kind of preparation method of aqueous fluorine-modified polyurethane resin, it comprises the steps:
[0043] (1) Preparation of fluorine-modified polyurethane prepolymer
[0044] 1) Add macromolecular polyols to the reaction kettle equipped with stirring paddles, thermometers, and reflux condensers. After vacuum dehydration at 95°C for 1.5 hours, cool to below 50°C, add isocyanate monomers, and heat up to 85°C Reaction 3h;
[0045] 2) After the reaction in step 1), the temperature of the reaction kettle is lowered to below 50°C, adding a compound with a hydrophilic group, a chain extender, and adding a solvent for viscosity adjustment, and then raising the temperature to 80°C for reflux reaction for 1.5h, and the reaction Properly add solvent during the process to adjust the viscosity of the prepolymer;
[0046]3) After the reaction in step 2), the temperature of the reactor is lowered to below 50°C, adding fluorine-containing diol, solvent and catalys...
Embodiment 2
[0057] Embodiment 2: a kind of preparation method of aqueous fluorine-modified polyurethane resin, it comprises the steps:
[0058] (1) Preparation of fluorine-modified polyurethane prepolymer
[0059] 1) Add macromolecular polyols to the reaction kettle equipped with stirring paddles, thermometers, and reflux condensers. After vacuum dehydration at 100°C for 1 hour, cool to below 50°C, add isocyanate monomers, and heat up to 90°C for reaction 2.5 hours;
[0060] 2) After the reaction in step 1) is completed, the temperature of the reactor is lowered to below 50°C, adding a compound with a hydrophilic group, a chain extender, and adding a solvent for viscosity adjustment, and then raising the temperature to 75°C for reflux reaction for 3 hours, the reaction process Appropriate additional solvent in the medium to adjust the viscosity of the prepolymer;
[0061] 3) After the reaction in step 2), the temperature of the reactor is lowered to below 50°C, adding fluorine-containin...
Embodiment 3
[0072] Embodiment 3: a kind of preparation method of aqueous fluorine-modified polyurethane resin, it comprises the steps:
[0073] (1) Preparation of fluorine-modified polyurethane prepolymer
[0074] 1) Add macromolecular polyols to the reaction kettle equipped with stirring paddles, thermometers, and reflux condensers. After vacuum dehydration at 90°C for 2 hours, cool to below 50°C, add isocyanate monomers, and heat up to 85°C for reaction 3.5 hours;
[0075] 2) After the reaction in step 1), the temperature of the reactor is lowered to below 50°C, adding a compound with a hydrophilic group, a chain extender, and adding a solvent for viscosity adjustment, and then raising the temperature to 78°C for reflux reaction for 2 hours, the reaction process Appropriate additional solvent in the medium to adjust the viscosity of the prepolymer;
[0076] 3) After the reaction in step 2), the temperature of the reactor is lowered to below 50°C, adding fluorine-containing diol, solve...
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